JP2015199419A - On-vehicle electronic control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-vehicle electronic control device that can achieve the miniaturization of a relay exclusive unit while simplifying signal line wiring between an on-vehicle load and the relay exclusive unit.SOLUTION: An on-vehicle electronic control device 100 includes a plurality of relay exclusive units 121-124, each of which functions as an exclusive instrument that is provided in correspondence with a plurality of on-vehicle loads 21-24 for relaying an input signal, and a control signal generation unit 110 that creates a control signal given individually to each of the plurality of relay exclusive units 121-124 as a digital signal, and supplies the control signal as an input signal of the relay exclusive units 121-124. The control signal generation unit 110 creates, of the control signals, two or more control signals to be given to the different units in a unitary manner.

Description

  The present invention relates to an on-vehicle electronic control device, and more particularly to miniaturization of each unit constituting the same.

  For example, Japanese Patent Application Laid-Open No. 01-164644 (Patent Document 1) discloses an automobile network that includes an integrated control unit that integrates a plurality of control functions and an I / O unit that enables communication of a plurality of signals having different communication speeds. A system is formed.

Japanese Patent Laid-Open No. 01-164644

  However, according to the technique of Patent Document 1, the I / O unit (relay-dedicated unit) collectively processes a signal having a low communication speed and a signal having a high communication speed, so that the circuit configuration is configured to process such a plurality of types of signals. Is complicated. According to this, as the I / O unit becomes complicated, the size of the unit increases. Moreover, if the I / O units are integrated together, the wiring of the control target (vehicle load) becomes complicated, and the analog signal output from the I / O unit is damaged. Occurs.

  In view of the above problems, an object of the present invention is to provide an in-vehicle electronic control device that simplifies signal line routing between an in-vehicle load and a relay-dedicated unit and also realizes downsizing of the relay-dedicated unit.

In order to solve the above-described problems, the present invention has the following configuration of an on-vehicle electronic control device. In other words, a plurality of dedicated relay units each functioning as a dedicated device for relaying input signals provided corresponding to a plurality of in-vehicle loads, and a control signal individually given to each of the plurality of dedicated relay units are created as digital signals And a control signal generation unit that supplies the control signal as an input signal of the relay-dedicated unit,
The control signal generation unit generates two or more control signals to be given to different units among the control signals.

  Preferably, the relay dedicated unit includes a DA conversion function unit, and the DA conversion function unit converts the control signal from a digital signal to an analog signal and supplies the converted signal to the in-vehicle load.

  Preferably, the relay dedicated unit includes an AD conversion function unit, and the AD conversion function unit converts the sensor signal of the in-vehicle load from an analog signal to a digital signal and outputs the signal to the control signal generation unit. I will do it.

  Preferably, both the DA conversion function unit and the AD conversion function unit are configured by one unit.

  Preferably, both the DA conversion function unit and the AD conversion function unit are configured by one device.

  Preferably, the relay dedicated unit is constructed by a programmable logic device.

  Preferably, the AD conversion function unit receives two or more sensor signals given from each of the plurality of in-vehicle loads as input signals, and converts the two or more sensor signals into digital signals.

  Preferably, the relay-dedicated unit is not equipped with the DA conversion function unit but is equipped with the AD conversion function unit.

  According to the on-vehicle electronic control device according to the present invention, since the relay dedicated unit is individually provided corresponding to the on-vehicle load, the circuit configuration and connection terminal of the unit are simplified and the number of parts is reduced accordingly, and the size is extremely small. Units can be provided. Further, since the relay dedicated unit is in a downsized form, it can be arranged close to the on-vehicle load, which contributes to a significant reduction in the signal line routing distance.

The figure which shows the structure of the vehicle-mounted electronic control apparatus which concerns on embodiment. The figure which shows the structure of the relay exclusive unit which concerns on embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a configuration of an in-vehicle electronic control device according to the present embodiment. As shown in the figure, the on-vehicle electronic control device 100 includes a control signal generation unit 110 and a relay dedicated unit group 120. The relay dedicated unit group 120 includes a plurality of relay dedicated units 121 to 124. Each of the plurality of relay dedicated units 121 to 124 is provided corresponding to the on-vehicle loads 21 to 24.

  In the present embodiment, one signal generation unit 110 is provided. In the signal generation unit 110, a constant voltage circuit 111, a CAN transceiver 112, a microcomputer 113, an I / O circuit 115, a connector 116, and the like are stored in a housing.

  Among these, the microcomputer 113 includes a CPU, a memory circuit, a clock circuit, and the like, and functions as a multifunctional arithmetic circuit. The microcomputer 113 has a function constructed by an appropriate program and numerical data, performs desired arithmetic processing in the sequence of the control program, and sequentially calculates processing results.

  The microcomputer 113 generates and outputs a control signal (digital signal state) based on the sensor signal (digital signal state). The control signal is a signal transmitted individually to each of the plurality of relay dedicated units 121 to 123. Accordingly, each of the control signals becomes an input signal of the relay dedicated units 121 to 123. That is, since the microcomputer 113 according to the present embodiment supplies a control signal to each of the relay dedicated units 121 to 123, a functional unit that performs arithmetic processing on each of the control signals is constructed. Examples of the control signal include a transmission control signal, an EPS (Electric Power Steering) control signal, a BCM (Body Control Module) control signal for controlling a light or a door lock, and the like. As described above, the microcomputer 113 is a circuit that integrally generates a plurality (two or more) of control signals to be given to different relay dedicated units.

  The microcomputer 113 has a CAN protocol controller 114 built therein, and performs communication arbitration and data error check. The microcomputer 113 acquires the vehicle information signal transmitted via the CAN communication line L1, and calculates the control signal described above based on this information.

  The I / O circuit 115 is a digital interface of the unit, and has a function of outputting a digital signal to the outside or taking in the digital signal. The I / O circuit 115 is assigned a port address for each I / O port, and by controlling this, a control signal is output to a desired relay-dedicated unit. Such an I / O circuit 115 may be built in the microcomputer 113.

  Each of these element circuits is driven by a power source generated by the constant voltage circuit 111. The power supply current supplied to these element circuits flows to the ground potential via the ground line.

  The connector 116 includes a power supply terminal t1, a signal terminal t2, and a ground terminal t3. A power supply voltage is applied to the power supply terminal t1, and a control signal / sensor signal is output or input to the signal terminal t2, and grounding is performed. The terminal t3 is wired so as to have the same potential as the ground potential. Note that the number of terminals for the signal terminal t2 is actually set according to the type of control signal and the type of sensor signal.

  The relay line L2 branches into a plurality of power lines, signal lines, and earth lines as one bundle. That is, the relay wiring L2 connects between the control signal generation unit 110 and the relay dedicated unit 120, and is connected to one control signal generation unit 110 on the one hand and to each of the relay dedicated units 120 on the other hand. Connected. In other words, each of the relay dedicated units 120 is supplied with power supply power and signals through the relay wiring L2. According to this, the relay dedicated unit 120 can receive power without providing a power supply circuit in itself, and the circuit configuration of each unit is simplified.

  Each of the relay dedicated units 121 to 124 functions as a dedicated device that relays a signal given as an input signal. Among these, the relay exclusive unit 121 is provided corresponding to a vehicle-mounted load serving as a transmission driving device. The relay dedicated unit 121 is provided corresponding to an in-vehicle load called EPS (Electric Power Steering). The relay-dedicated unit 123 is provided corresponding to an in-vehicle load called BCM (Body Control Module). The relay-dedicated unit 124 is a device that collectively sends sensor signals from a plurality of in-vehicle loads as a unit dedicated to sensor signals.

  These relay dedicated units 121 to 124 and the in-vehicle loads 21 to 24 corresponding thereto are connected via individual signal lines L3. The signal line L3 is a line for transmitting a control signal (analog signal). By shortening the signal line L3, the wiring impedance is reduced, and the analog signal is prevented from being damaged.

  As shown in FIG. 2, each of the relay dedicated units 121 to 124 includes a connector 121a and a device 210 appropriately wired thereto. In particular, the device 210 does not perform a calculation process such as a microcomputer, but is specialized for simply converting a digital signal into an analog signal. According to this, since an unnecessary circuit for calculation can be eliminated, the configuration of the relay dedicated unit can be simplified. In addition, since the configuration is simplified as described above, the unit can be reduced in size. Further, with the miniaturization of the relay dedicated unit, the degree of freedom in layout of the unit is improved. According to this, since the relay dedicated unit can be arranged in an appropriate gap portion of the vehicle-mounted load, the analog signal wiring L3 can be shortened.

  According to the on-vehicle electronic control device 100 according to the present embodiment, since the relay dedicated unit is individually provided corresponding to the on-vehicle load, the circuit configuration and connection terminal of the unit are simplified and the number of parts is reduced accordingly. An extremely small unit can be provided. Further, since the relay dedicated unit is in a downsized form, it can be arranged close to the on-vehicle load, which contributes to a significant reduction in the signal line routing distance.

  In addition, since the relay dedicated unit according to the present embodiment is individually provided for each on-vehicle load, a complicated circuit configuration that is controlled at different communication speeds is not employed. For this reason, it will be understood that the circuit configuration of each unit is simplified.

  The relay dedicated unit may be provided with a drive circuit for adjusting the signal voltage to the vehicle load. Even in such a case, the relay-dedicated unit contributes to the miniaturization of the unit within the scope of the embodiment of the drive circuit. According to this, the control signal generation unit excludes the unnecessary configuration except for the circuit configuration related to the calculation of the control signal, and the miniaturization of the unit is promoted.

  FIG. 2A shows the relay dedicated unit 121 connected to the automatic transmission control device. In the relay dedicated unit 121, the drive signal of the mission motor is output as the control signal S1, and the signal indicating the mission position is input as the sensor signal. The device 210 provided in the relay-dedicated unit 121 is controlled by converting a control signal from a digital signal to an analog signal and outputting it outside (DA conversion function unit), and converting a sensor signal from an analog signal to a digital signal. A function unit (AD conversion function unit) that outputs to the signal generation unit is constructed together. According to Fig.2 (a), the relay exclusive unit required by one vehicle-mounted load can be concentrated on one device.

  FIG. 2B shows a relay dedicated unit 122 corresponding to EPS. The relay dedicated unit 122 outputs a torque assist motor drive signal as a control signal S1. On the other hand, in a separate independent relay unit (not shown), a torque signal is input as a sensor signal and relayed to the control signal generation unit. The EPS may be provided with the torque signal output terminal and the assist motor housing separated from each other. For this reason, it is advantageous to shorten the wiring distance of the analog signal by deliberately dividing the unit into which only the DA conversion function unit is mounted and the unit having only the AD conversion function unit.

  FIG. 2 (c) shows a state in which sensor signals are given to one relay dedicated unit from a plurality of different on-vehicle loads 22 to 23, that is, a plurality of input signals are given to one relay dedicated unit from each on-board load. An example is shown. In this case, the relay dedicated unit individually converts each signal into a digital signal and outputs the digital signal to the control signal generation unit. This example is useful when there are a plurality of in-vehicle loads and sensor signal output terminals are relatively close to each other. In this case, if only the AD conversion function unit is mounted on the relay dedicated unit, the relay dedicated unit can be arranged at the most convenient place for the detection of the sensor signal. Further, if a DA conversion function unit is also mounted on this, the aspect consolidates a plurality of DA conversion functions in one device, which contributes to a reduction in the number of units.

  Furthermore, in this embodiment, a programmable logic device is used as a signal conversion device. A programmable logic device is an LSI that can change the logic structure of a completed substrate, and is a device formed based on an integrated circuit of memory cells. The programmable logic device includes PLA (Programmable Logic Array), PAL (Programmable Array Logic), FPGA (Field Programmable Gate Array), and the like.

  As shown in FIG. 2, the logic device 210 includes I / O blocks 211 to 212, a digital clock manager (not shown), a logic block 213, and the like on a substrate. The device 210 is provided with an internal data line Ls, external data lines L3x, L3y, and the like.

  The digital clock manager provides a clock signal to the entire device, and this function realizes “Phase Lock Loop Control”. That is, each circuit unit whose function is constructed in the device is uniformly controlled by this clock signal, and synchronous signal processing is performed.

  The I / O blocks 211 to 212 are provided with various interface functions (I / O elements) in addition to LVDS and LVCMOS. As described above, the I / O block controls the interface function unit, thereby taking a function of taking a certain signal into the logic device 210, and outputting another certain signal to the outside of the logic device 210. Take on the function. As described above, the programmable logic device originally has a communication circuit configuration, which is advantageous in simplifying the circuit configuration.

  The logic block 213 is obtained by integrating a plurality of elements. The element includes a lookup table, a multiplexer, and a register, which are connected to each other by an interconnect. In this logic block, the connection path can be freely changed by controlling a switch mechanism provided in the interconnect (programmable function). In the case of an FPGA, function construction related to signal conversion is easily performed by a configuration trom (not shown).

  As described above, building the functions according to the present embodiment with a programmable logic device realizes an AD conversion function unit, a DA conversion function unit, an I / O function unit, and the like with a simple configuration. Therefore, it will be fully understood that the relay-dedicated unit formed thereby contributes to the miniaturization of the apparatus.

  100 vehicle-mounted electronic control unit, 110 control signal generation unit, 120 relay dedicated unit group, 121-124 relay dedicated unit.

Claims (8)

A plurality of dedicated relay units each functioning as a dedicated device for relaying input signals provided corresponding to a plurality of in-vehicle loads, and a control signal individually given to each of the plurality of dedicated relay units are created as digital signals A control signal generating unit that supplies a control signal as an input signal of the relay-dedicated unit;
The on-vehicle electronic control device, wherein the control signal generation unit generates two or more control signals to be given to different units among the control signals.   The relay dedicated unit includes a DA conversion function unit, and the DA conversion function unit converts the control signal from a digital signal to an analog signal and supplies the converted signal to the vehicle load. The on-vehicle electronic control device according to 1.   The relay dedicated unit includes an AD conversion function unit, and the AD conversion function unit converts the sensor signal of the vehicle load from an analog signal to a digital signal and outputs the signal to the control signal generation unit. The in-vehicle electronic control device according to claim 1 or 2, wherein the on-vehicle electronic control device is characterized.   The in-vehicle electronic control device according to claim 3, wherein both the DA conversion function unit and the AD conversion function unit are configured by a single unit.   The in-vehicle electronic control device according to claim 4, wherein both the DA conversion function unit and the AD conversion function unit are configured by a single device.   The on-vehicle electronic control device according to any one of claims 1 to 5, wherein the relay-dedicated unit is constructed by a programmable logic device.   4. The AD conversion function unit receives two or more sensor signals given from each of the plurality of in-vehicle loads as input signals, and converts the two or more sensor signals into digital signals. The vehicle-mounted electronic control apparatus as described in any one of thru | or 6 thru | or 6.   8. The on-vehicle electronic control device according to claim 7, wherein the relay dedicated unit is mounted with the AD conversion function unit without being mounted with the DA conversion function unit.

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